DTC P0645: A/C Clutch Relay (A/CCR) Primary Circuit Malfunction (Also Referred To As WAC Circuit)
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P0645 - A/C CLUTCH RELAY (A/CCR) PRIMARY CIRCUIT MALFUNCTION (ALSO REFERRED TO AS WAC CIRCUIT)
| Description: | Monitors the A/CCR circuit output from the PCM. The test fails if the PCM grounds the A/CCR circuit, and excessive current draw is detected on the A/CCR circuit; or, with the A/CCR circuit not grounded by the PCM, voltage is not detected on the A/CCR circuit. The PCM expects to detect VPWR voltage coming through the A/CCR relay coil to the A/CCR circuit. | ||
| Possible Causes: |
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| Diagnostic Aids: | The WACF PID is for the A/CCR circuit. When the WACF PID reads YES, a fault is currently present. An open circuit or short to ground can only be detected when the PCM is not grounding the circuit. A short to power can only be detected when the PCM is grounding the circuit. During the KOEO and KOER self-test, the A/CCR circuit is cycled on and off. Verify the A/C and defrost were off during the KOEO and KOER self-tests. Check the ACCS PID to verify. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to Pinpoint Test KM . | ||